Which of the following does not show metamorphosis ?
Frog
Housefly
Hydra
Mosquito
Correct Answer :
C. Hydra
Related Questions
For fertilization of the frog's egg
sperms of same species are essential
sperms do not need penetration
sperms of any animal can fertilize
only presence of male is sufficient
Antifertilizin is secreted by
fertilized egg
spermatozoa
unfertilized egg
egg membranes
The cellular movements during gastrula-tion are called
epiboly
emboly
morphogenetic movements
involution
During normal development the activation of the egg is achieved by
vitellogenesis
oogenesis
spermatogenesis
fertilization
Grey cresent is present in
zygote of frog
brain of rabbit
eye of frog
retina of cockroach
Mammalian placenta is
a cord between mother and foetus
place of attachment in uterus wall where exchange of material between mother and foetus takes place
outer covering of foetus
allantoic part of the uterus
Development of egg without fertilization is termed as
parthenogenesis
parthenocarpy
polyembryony
paedogenesis
The formation, development and matura- j tion of the female gamete is called
ovulation
oogenesis
vitellogenesis
folliculogenesis
The sexual embrage of the male and female frogs is called
copulation
amphimixis
syngamy
amplexus
The process of synthesis of yolk by the oocyte is termed
folliculogenesis
oogenesis
vitellogenesis
spermiogenesis
The substance fertilizin is secreted by
ova
sperm
both and
primary spermatogonia
In frog, gastrulation is completed by
epiboly
emboly
both and
delamination
How many cleavages are completed in 16 cell stages of frog's egg ?
3
8
4
12
In forg, the sperms released from the testis take the following route to reach the ureter:
Vasa efferentia, Bidder's canal, uriniferous tubule and nephrotome
Vasa efferentia, Bidder's canal, and uriniferous tubule
Vasa efferentia, uriniferous tubule nd Bidder's canal.
Vasa deferentia, uriniferous tubule and Bidder's canal
The sperm produces substances of enzymatic nature of sperm lysin. In mammals, it is called
hyaluronidase
hyaluronic acid
androgamone
cryanogamone
A freshly unfertilised egg of hen contains
one cell
100 cells
1000 cells
10000 cells
The expulsion of completely developed foetus from the uterus is known as
ovuation
placentation
gestation
parturition
Oogonia entering the growth phase of oogenesis is called
primary oocyte
secodnary oocyte
ootid
gonocyte
Metamorphosis is a characteristic feature of
direct ontogenic development
indirect ontogenic development
chordates
embryogenesis in mammals
The nervous system, epidermis and hairs and nails are derivatives of
endoderm
mesoderm
ectoderm
chordomesoderm
During metamorphosis, the disappearance of larval organs is called
histogenesis
paedogenesis
histolysis
paedomorphosis
In the growing oocyte, the nucleus enlarges in size due to an increase in
Proteins
Nucleoplasm
DNA
RNA
The formation of the neural tube is known as
neurulation
tubulation
crania tion
none of these
Which of the following develops from ectoderm ?
Spinal cord and brain
Liver and heart
Eye and skin
Notochord and vertebral colum.
In order to become structurally and functionally a spermatozoan, each spermatid has to undergo a process of differentiation called
spermiation
spermiogenesis
spermatogenesis
androgenesis
Embryo sac in a hen's egg is formed by
ectoderm
meso derm
somatic mesoderm and endoderm
splanchnic mesoderm and ectoderm
During fertilization the spermatozoa penetrate through the egg membranes with the help of
flagellum
acrosome
sperm lysins released from the acrosome
mitochondira located at the middle piece
Cleidoic eggs are found in
birds
mammals
insects
molluscs
Blastopore in frogs development occurs in
blastula and opens in blastocoel
blastula and opens in archenteron
gastrula and opens in blastocoel
gastrula and opens in archenteron
Sexual reproduction in larval condition is known as
paedogamy
autogamy
isogamy
anisogamy